Boat clock



FIG. 1 is a right side elevational view of a boat clock showing our new design;

FIG. 2 is a right end elevational view;

FIG. 3 is a left end elevational view;

FIG. 4 is a left side elevational view;

FIG. 5 is a top plan view; and

FIG. 6 is a bottom plan view. 

The ornamental design for a boat clock, as shown. 